乙烯装置碱洗塔运行问题原因分析及对策

CAUSE ANALYSIS AND COUNTERMEASURES FOR OPERATIONAL PROBLEMS OF CAUSTIC WASH TOWER IN ETHYLENE PLANT

乙烯装置碱洗塔的作用是吸收裂解气中的酸性气体CO_(2)和H_(2)S。在运行过程中,碱洗塔出现塔釜黄油生成量增加,碱洗吸收酸性气体效果差,造成塔顶裂解气中CO_(2)超标。CO_(2)在深冷低温操作的设备中结成干冰堵塞设备和管道,影响装置正常生产,造成乙烯产品不合格。文中叙述了碱洗塔改造情况及运行出现问题的原因和采取的对策,通过调整使得碱洗塔运行情况大为改善,确保了装置运行稳定和产品合格。

The caustic wash tower in ethylene plant is used to remove the acid gas such as CO_(2) and H_(2)S in cracking gas.During its operation,the increased accumulation of polymer at the bottom of caustic wash tower resulted in poor acid gas removal effect and over high CO_(2) in the overhead cracking gas.The CO_(2) formed dry ice in equipment for cryogenic operation and blocked the equipment and pipelines,affecting the normal operation of the plant and producing off-spec ethylene product.This article discusses the modification of caustic wash tower,the causes of the operational problems and the measures taken.Through adjustment,the operation of caustic wash tower was greatly improved,ensuring the stable operation and on-spec product of the ethylene plant.